.page-faq {
  --faq-data: var(--ice);
  --faq-version: var(--violet-text);
  --faq-cost: var(--orange);
  --faq-account: var(--lime);
  --faq-rail-w: 288px;
  position: relative;
}

.page-faq a {
  overflow-wrap: anywhere;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(26px, 5vw, 60px) 0 clamp(30px, 5vw, 56px);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    90deg,
    rgba(180, 255, 57, 0.05) 0 1px,
    transparent 1px 92px
  );
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  top: 16%;
  width: 58%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--violet), transparent);
  transform: rotate(-13deg);
  pointer-events: none;
}

.page-faq .faq-hero__main {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero__kicker {
  display: inline-block;
  margin: 0 0 16px;
  padding: 5px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--lime);
  background: rgba(180, 255, 57, 0.06);
}

.page-faq h1 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.12;
  font-size: clamp(30px, 6.4vw, 62px);
  color: var(--text);
  max-width: 18ch;
}

.page-faq .faq-hero__lead {
  margin: 0 0 26px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-soft);
}

.page-faq .faq-hero__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-faq .faq-hero__stats {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero__stats li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(160deg, var(--panel), var(--void));
}

.page-faq .faq-hero__num {
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  color: var(--lime);
  line-height: 1.1;
}

.page-faq .faq-hero__label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---------- 分类区 ---------- */
.page-faq .faq-cats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-faq .faq-cat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 20px 22px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--cat, var(--lime));
  border-radius: var(--r-lg);
  background: linear-gradient(170deg, var(--panel), rgba(8, 11, 17, 0.6));
  text-decoration: none;
  color: inherit;
  transition: transform 0.25s var(--ease-out), border-color 0.25s var(--ease-out);
}

.page-faq .faq-cat:hover,
.page-faq .faq-cat:focus-visible {
  transform: translateY(-2px);
  border-color: var(--cat, var(--lime));
}

.page-faq .faq-cat--data { --cat: var(--faq-data); }
.page-faq .faq-cat--version { --cat: var(--faq-version); }
.page-faq .faq-cat--cost { --cat: var(--faq-cost); }
.page-faq .faq-cat--account { --cat: var(--faq-account); }

.page-faq .faq-cat__idx {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-faq .faq-cat__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  color: var(--cat, var(--lime));
}

.page-faq .faq-cat__text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-soft);
}

.page-faq .faq-cats__figure {
  margin: 22px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--void);
}

.page-faq .faq-cats__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 两栏索引结构 ---------- */
.page-faq .faq-layout {
  padding-top: clamp(34px, 5vw, 60px);
  padding-bottom: clamp(34px, 5vw, 60px);
}

.page-faq .faq-rail {
  margin-bottom: 26px;
}

.page-faq .faq-rail .region-filter {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
}

.page-faq .faq-rail__nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--panel);
}

.page-faq .faq-rail__group {
  margin: 14px 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-faq .faq-rail__group:first-child {
  margin-top: 0;
}

.page-faq .faq-rail__link {
  display: block;
  padding: 7px 10px;
  border-left: 2px solid transparent;
  border-radius: var(--r-sm);
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-soft);
  text-decoration: none;
  transition: color 0.2s var(--ease-out), border-color 0.2s var(--ease-out), background 0.2s var(--ease-out);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: var(--lime);
  border-left-color: var(--lime);
  background: rgba(180, 255, 57, 0.06);
}

.page-faq .filter-empty {
  margin: 0 0 18px;
  padding: 14px 16px;
  border: 1px dashed var(--line);
  border-radius: var(--r-md);
  color: var(--muted);
  font-size: 14px;
}

.page-faq .filter-empty[hidden] {
  display: none;
}

/* ---------- 问答分组 ---------- */
.page-faq .faq-block {
  margin-bottom: clamp(30px, 4vw, 48px);
  scroll-margin-top: calc(var(--frame-h) + 24px);
}

.page-faq .faq-block:last-child {
  margin-bottom: 0;
}

.page-faq .faq-block__head {
  padding-bottom: 16px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-block__kicker {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--violet-text);
}

.page-faq .faq-block__head h2 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 3.2vw, 30px);
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-faq .faq-block__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .faq-block__split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-faq .faq-figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--panel);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-faq .media__caption {
  padding: 12px 16px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 折叠面板 ---------- */
.page-faq .faq-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-faq .faq-item {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--panel);
  scroll-margin-top: calc(var(--frame-h) + 24px);
  transition: border-color 0.25s var(--ease-out);
}

.page-faq .faq-item[open] {
  border-color: rgba(180, 255, 57, 0.55);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15.5px;
  line-height: 1.55;
  color: var(--text);
}

.page-faq .faq-item__q::-webkit-details-marker {
  display: none;
}

.page-faq .faq-item__q::after {
  content: "";
  flex: none;
  width: 10px;
  height: 10px;
  margin-left: auto;
  margin-top: 7px;
  border-right: 2px solid var(--lime);
  border-bottom: 2px solid var(--lime);
  transform: rotate(45deg);
  transition: transform 0.25s var(--ease-out);
}

.page-faq .faq-item[open] .faq-item__q::after {
  transform: rotate(-135deg);
}

.page-faq .faq-item__idx {
  flex: none;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--lime);
  padding-top: 3px;
}

.page-faq .faq-item__a {
  padding: 0 18px 18px 44px;
  border-top: 1px solid rgba(42, 58, 79, 0.7);
  margin-top: 2px;
  padding-top: 14px;
}

.page-faq .faq-item[open] .faq-item__a {
  animation: faq-panel-in 0.28s var(--ease-out) both;
}

@keyframes faq-panel-in {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-faq .faq-item__a p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-soft);
}

.page-faq .faq-item__a p:last-child {
  margin-bottom: 0;
}

.page-faq .faq-item__link {
  display: inline-block;
  color: var(--lime);
  font-size: 14px;
  text-decoration: none;
  border-bottom: 1px solid rgba(180, 255, 57, 0.4);
  padding-bottom: 2px;
}

.page-faq .faq-item__link:hover,
.page-faq .faq-item__link:focus-visible {
  color: var(--violet-text);
  border-bottom-color: var(--violet-text);
}

/* ---------- 收尾区 ---------- */
.page-faq .faq-help {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-faq .faq-help h2 {
  margin: 6px 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3.4vw, 32px);
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-faq .faq-help__body > p {
  margin: 0 0 16px;
  max-width: 60ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--text-soft);
}

.page-faq .faq-help__list {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-faq .faq-help__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text-soft);
}

.page-faq .faq-help__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--ice);
}

.page-faq .faq-help__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-faq .faq-help__card {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(165deg, rgba(180, 255, 57, 0.09), rgba(8, 11, 17, 0.4));
}

.page-faq .faq-help__time {
  margin: 0 0 4px;
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 700;
  color: var(--lime);
  line-height: 1.1;
}

.page-faq .faq-help__time-label {
  margin: 0 0 16px;
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.05em;
}

.page-faq .faq-help__mail {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--text);
  word-break: break-all;
}

.page-faq .faq-help__note {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-cats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .faq-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .faq-item__q {
    font-size: 16.5px;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-hero {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 48px;
    align-items: end;
  }

  .page-faq .faq-hero__stats {
    margin-top: 0;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .faq-cats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .faq-layout {
    display: grid;
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: 46px;
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--frame-h) + 22px);
    margin-bottom: 0;
    max-height: calc(100vh - var(--frame-h) - 44px);
    overflow-y: auto;
    padding-right: 4px;
  }

  .page-faq .faq-block__split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 320px);
    gap: 24px;
    align-items: start;
  }

  .page-faq .faq-help {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 44px;
    align-items: center;
  }

  .page-faq .faq-item__q {
    padding: 18px 22px;
  }

  .page-faq .faq-item__a {
    padding: 16px 22px 20px 58px;
    border-top: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-cat,
  .page-faq .faq-item,
  .page-faq .faq-item__q::after,
  .page-faq .faq-rail__link {
    transition: none;
  }

  .page-faq .faq-item[open] .faq-item__a {
    animation: none;
  }
}